Honeywell AQ25A Series Technical Reference Booklet page 120

AQ252 Universal Injection/Mixing Boiler Reset Control Panels
Setup is enabled in the EQUIPMENT SETUP > SECONDARY
LOOP sub-menu when the INJECT parameter is set to
ENABLE (see Fig. 25 on page 41). The pump remains off
(drive is off) whenever the Return temperature is below the
Boiler Minimum Return temperature.
4. Line Voltage Rated Aux Output (Aux. Pump)
To connect a line voltage auxiliary device to these contacts,
such as a group pump or a boiler bypass pump, power the
device from the N and L terminals on the bottom of the Control
Module, running the hot (L) lead through the Aux. Pump
contacts. See Fig. 16 for details. The exact wiring schematic
will depend on what is connected to these dry contacts.
The Aux Pump is a line voltage rated dry contact that is
controlled by the selection in the EQUIPMENT SETUP >
AUXILIARY I/O sub-menu (see Fig. 25 on page 41).
Fig. 16. Wiring of the Aux. pump line voltage rated dry contacts (example shown is a by-pass pump).
FROM LINE VOLTAGE
120V TERMINALS
(N AND L) ON BOTTOM
OF TRANSFORMER
Fig. 17. Wiring for Boiler Pump, Secondary (Mixed) Loop Pump, DHW Device, Injection Pump, and Aux Output.
Step 6 – Connection To Line Voltage Power
Connect the N and L line voltage inputs of the primary on the
AQ252 transformer to the electrical distribution panel and
power up the Control. A service switch should be installed on
the hot (L) lead to the distribution panel.
69-1986—02
BY-PASS PUMP
TO AUXILIARY DEVICE
(INSTALLER-DEFINED)
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Fig. 18. Connections for multiple Zoning Panels - parallel wiring.
NOTE: Use of this output is optional. The Aux. pump dry con-
tacts are line voltage-rated but unpowered. A low volt-
age device can be connected to these programmable
contacts, but the wire's insulation must meet applica-
ble codes for use in line voltage enclosures.
See page 32 for programming options for the Aux.
Pump dry contacts.
5. Secondary Pump
Connect the N and L wires of the secondary (mixed) loop
pump to the N and switched terminals of the line voltage Sec.
output. shown in Fig. 17. The ground wire of the pump can be
connected to any of the 8 ground screw terminals located on
the back surface of the Control Panel enclosure.
The secondary pump terminals energize only when a zone that
has been designated as a secondary zone has a call for heat.
This enables the pump and the mixing device you have chosen
for the loop control. Set-up is enabled in the EQUIPMENT
SETUP > PRI/SEC sub-menu (see Fig. 25 on page 41).
If multiple Zoning Modules are connected to the AQ252
Control Panel, the line voltage wiring can either be run directly
from the N and L terminals on the primary of the transformer to
each Zoning Module (Fig. 18), or run in a daisy chain from the
N and L terminals of one AQ2000 module to the N and L
terminals of the next AQ2000 module (see Fig. 19 on
page 15).
OK
Zone 1 Zone 2 Zone 3 Zone 4
14
M27693A
Zone 1 Zone 2 Zone 3 Zone 4 Zone 1 Zone 2
M27694A
Zone 3 Zone 4
M27745A